Question

as a scuba diver descends toward the bottom of the ocean, she experiences the sensation of her ears "popping" based on your observations from the can crush lab, explains why this happen

Answer 1

Compare the 2 situations. You know that gravity pulls down towards the centre of the earth, we call this acceleration. When there is more mass on top off you, there is more more force pushing you down (Newton's second law of motion: Force=mass*acceleration).
So the person deeper experiences a greater force (pressure).